NokiaN97Forum just let us know that the Nokia flag phone N97 gets a new firmware today! This update will come to all the regions until 7/2, you can check if you can update your firmware here.
Here's the official changelog from Nokia.com

Here's the big news to all 5800XM users. Our 5800XM finally gets the new firmware v40 and the kinetic scrolling feature we have been waiting for a long time! After update, the homescreen changes to the style of 5530's which has contacts bar.
This firmware is not come to all the regions yet. If your phone [...]

Performance Fixes
New icons in Application Manager
Application Manager remembers the position prior to app installation( it used to go to the top on refresh before)
Red Pill mode does not work.
OVI Catalogue has been added to list of repositories
FM Transmitter Fixes

Good news to Nokia 5800 XpressMusic users. 5800 XM gets a new firmware v31.0.101 today. You can update your phone with Nokia Software Update or FOTA. The new firmware is now available in some countries now. For other users, you have to modify your phone code to update. We strongly recommend you backup your data before any [...]

We just get news from Symbian World that Nokia N97 has got a new firmware v12.2.024 for RM-507 currently. But we have not got the details about this update. Some users say that after the update, it gets quicker to switch between landscape mode and normal mode; quicker to load OVI maps. You can update to [...]